1) I do not remember anything special at HDDR for Thanksgiving.
. . . Hoop-Dee-Do is always Hoop-Dee-Do
. . . it hasn't changed in all these years
. . . OK, two songs were changed because WDW didn't want to pay royalties
2) Others might have other memories.

I have seen a lot of Traditional Thanksgiving dinners at many of the WDW restaurants. There is usually a Holiday Dining section on the drop down tab onthe Disney Dining web page. Thanksgiving and Christmas will show up later in the year.

However, I have never seen Hoop de Doo Revue on any of those lists. It's the same menu all year long as far as I know.

I honestly can't think of a better way to spend Thanksgiving than at the Hoop-de-Doo. I might have to change some travel plans to be able to do this, now that you have put the thought into my head! I say go find turkey at lunch, then do this at the end of the day to end on a high note.